Mike_rx8_swe

Hi all,

I'm having a issue with my OMP. There's no flow that I can see in the oil metering lines.

what I have checked / done:
- The vacuum hoses to the oil injectors, those seams to be fine. All connected... I've a new fuel insulator (the plastic detail, for vacuum, where all oil injectors are connected to)
- The oil injectors are new (maybe 1000km or 620 miles on it)
- The oil injector hose are not clogged. I verified one by one, by injecting oil manually with a syringe.
- replaced the OMP with another OMP that was in good working condition
- No DTCs

One thing that I thought was strange was that when I connected the other OMP it pumped oil at the beginning and then stopped.

How can I read/write the OMP PIDs MOP_POS and MOP_SW? Is it possible with Forscan? or do I need some special Mazda Tool?

I appreciate all tips... thank you in advance!

Mike_rx8_swe

Hi again,

An update on this issue. It's possible to use Forscan and tweak the value of the OMP. The values that the OMP accept is between 0-60 and I set MOP_POS to 35 and after a few seconds I could see the oil in the lines moving. So the OMP is not bad.

So the next step here is to find out why air is coming inside the lines?

Do you guys have any clue why I'm getting air in my OMP lines ? Is it possible that my Oil injector are bad (those are NEW from Mazda)?

I appreciate all tips... thank you in advance!

Loki

iTrader: (1)

How are you measuring flow? The flow there is VERY slow: milliliters per minute. Especially at idle (it might actually be off at idle)
The way this is supposed to work is oil is deposited on the housings during operation and very little is added during idle, on the assumption that the car is not spending a lot of time at idle, nor is there enough heat/pressure to burn it off at idle or is there any real pressure on the apex seals without load, so it's not necessary. So a better measurement is to see how much oil is consumed after a drive, rather than watching the lines while not driving the car. Just premix while you're running the engine with a questionable OMP.

Mike_rx8_swe

Thank you for your reply Loki. Great explanation!

So it's probably that my OMP is well-worn and does not create enough pressure to pump the oil at idle and therefore I'm getting air inside the lines then?

Mike_rx8_swe

Somebody know where to buy the internals of the RX8 oil metering pump? I mean it should be possible right ?
A new one is over $1100 now a days and probably will go up more and more.

Loki

iTrader: (1)

ebay usually has some used ones. But, it can't really *not* pump, it doesn't build pressure, just displaces the oil like an elevator. What exactly do you mean by 'air getting in"? Are you seeing bubbles move through the output hoses? Could the hoses be damaged? They become very brittle with time.

Mike_rx8_swe

yes, you're right it does pump but when I leave it idling for a like 5 minutes it builds air pockets. In all four oil lines (output hoses)

The lines are new and I could not see any leakage. and the oil injectors are new too...

Can it be the air coming in through the oil injectors? I mean it has an air supply to help with atomization, right?

I heard that it can be an internal leak. that the Pistons and sleeve inside of the OMP have too much play and at idle it does not create enough pressure to keep/hold air out.

I can not see any external leak on the OMP either.